fix: remove erroneous closing tag from wake-up documentation

- Removed stray </initial_code> tag at end of file
- This was causing test failures in the CI pipeline

Author: codegen-sh[bot]

docs/capabilities/wake-up.mdx

@@ -73,4 +73,3 @@ The wake-up system integrates deeply with GitHub:
 - **Faster Iteration:** PRs get fixed automatically, keeping development velocity high
 - **Learning from Failures:** Each fix improves Codegen's understanding of your codebase
 - **24/7 Monitoring:** Works around the clock to keep your PRs in good shape
-</initial_code>